#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include "common/amd_family.h"
#include "drm-shim/drm_shim.h"
#include "util/log.h"
#include <util/u_math.h>
#include <radeon_drm.h>

bool drm_shim_driver_prefers_first_render_node = true;

static enum radeon_family radeon_family = CHIP_RV515;
static uint16_t device_id = 0x7140;

static int
radeon_ioctl_noop(int fd, unsigned long request, void *arg)
{
   return 0;
}

static int
radeon_ioctl_info(int fd, unsigned long request, void *arg)
{
   struct drm_radeon_info *info = arg;
   uint32_t *value = (uint32_t *)(intptr_t)info->value;

   switch (info->request) {
   case RADEON_INFO_DEVICE_ID:
      *value = device_id;
      return 0;

   case RADEON_INFO_RING_WORKING:
   case RADEON_INFO_ACCEL_WORKING2:
   case RADEON_INFO_VA_UNMAP_WORKING:
      *value = true;
      return 0;

   case RADEON_INFO_GPU_RESET_COUNTER:
      *value = 0;
      return 0;

   case RADEON_INFO_IB_VM_MAX_SIZE:
      if (radeon_family < CHIP_CAYMAN)
         return -EINVAL;
      *value = 64 << 10;
      return 0;

   case RADEON_INFO_VCE_FW_VERSION:
   case RADEON_INFO_TILING_CONFIG:
   case RADEON_INFO_BACKEND_MAP:
      *value = 0; /* dummy */
      return 0;

   case RADEON_INFO_VA_START:
      return 4096;

   case RADEON_INFO_MAX_SCLK:
   case RADEON_INFO_CLOCK_CRYSTAL_FREQ:
   case RADEON_INFO_NUM_GB_PIPES:
   case RADEON_INFO_NUM_Z_PIPES:
   case RADEON_INFO_MAX_PIPES:
   case RADEON_INFO_MAX_SE:
   case RADEON_INFO_MAX_SH_PER_SE:
   case RADEON_INFO_ACTIVE_CU_COUNT:
   case RADEON_INFO_NUM_BACKENDS:
   case RADEON_INFO_NUM_TILE_PIPES:
      *value = 1; /* dummy */
      return 0;

   default:
      fprintf(stderr, "Unknown DRM_IOCTL_RADEON_INFO request 0x%02X\n", info->request);
      return -1;
   }
}

static int
radeon_ioctl_gem_info(int fd, unsigned long request, void *arg)
{
   struct drm_radeon_gem_info *info = arg;

   /* Dummy values. */
   info->vram_size = 256 * 1024 * 1024;
   info->vram_visible = info->vram_size;
   info->gart_size = 512 * 1024 * 1024;

   return 0;
}

static int
radeon_ioctl_gem_create(int fd, unsigned long request, void *arg)
{
   struct drm_radeon_gem_create *create = arg;

   struct shim_fd *shim_fd = drm_shim_fd_lookup(fd);
   struct shim_bo *bo = calloc(1, sizeof(*bo));
   size_t size = (size_t)align64(create->size, 4096);

   drm_shim_bo_init(bo, size);

   create->handle = drm_shim_bo_get_handle(shim_fd, bo);

   drm_shim_bo_put(bo);

   return 0;
}

static int
radeon_ioctl_gem_mmap(int fd, unsigned long request, void *arg)
{
   struct drm_radeon_gem_mmap *mmap_bo = arg;

   struct shim_fd *shim_fd = drm_shim_fd_lookup(fd);
   struct shim_bo *bo = drm_shim_bo_lookup(shim_fd, mmap_bo->handle);

   mmap_bo->addr_ptr = drm_shim_bo_get_mmap_offset(shim_fd, bo);

   return 0;
}

static int
radeon_ioctl_gem_userptr(int fd, unsigned long request, void *arg)
{
   /* probed at winsys init, just return no support. */
   return -EINVAL;
}

static ioctl_fn_t driver_ioctls[] = {
   [DRM_RADEON_CS] = radeon_ioctl_noop,
   [DRM_RADEON_INFO] = radeon_ioctl_info,
   [DRM_RADEON_GEM_SET_DOMAIN] = radeon_ioctl_noop,
   [DRM_RADEON_GEM_SET_TILING] = radeon_ioctl_noop,
   [DRM_RADEON_GEM_WAIT_IDLE] = radeon_ioctl_noop,
   [DRM_RADEON_GEM_INFO] = radeon_ioctl_gem_info,
   [DRM_RADEON_GEM_CREATE] = radeon_ioctl_gem_create,
   [DRM_RADEON_GEM_MMAP] = radeon_ioctl_gem_mmap,
   [DRM_RADEON_GEM_USERPTR] = radeon_ioctl_gem_userptr,
};

struct radeon_pci_id {
   uint16_t device_id;
   const char *name;
   enum radeon_family family;
   const char *family_name;
};

#define CHIPSET(d, n, f) {.device_id = (d), .name = #n, .family = CHIP_##f, .family_name = #f},
static const struct radeon_pci_id radeon_pci_ids[] = {
#include "pci_ids/r300_pci_ids.h"
#include "pci_ids/r600_pci_ids.h"
};
#undef CHIPSET

static void
radeon_get_device_id()
{
   const char *gpu_id = getenv("RADEON_GPU_ID");
   if (!gpu_id)
      return;

   if (strncmp(gpu_id, "0x", 2) == 0) {
      device_id = strtoll(gpu_id + 2, NULL, 16);
      return;
   }

   for (int i = 0; i < ARRAY_SIZE(radeon_pci_ids); i++) {
      if (strcasecmp(gpu_id, radeon_pci_ids[i].name) == 0 ||
          strcasecmp(gpu_id, radeon_pci_ids[i].family_name) == 0) {
         device_id = radeon_pci_ids[i].device_id;
         return;
      }
   }

   mesa_loge("Failed to find radeon GPU named \"%s\"\n", gpu_id);
   abort();
}

void
drm_shim_driver_init(void)
{
   radeon_get_device_id();

   shim_device.bus_type = DRM_BUS_PCI;
   shim_device.driver_name = "radeon";
   shim_device.driver_ioctls = driver_ioctls;
   shim_device.driver_ioctl_count = ARRAY_SIZE(driver_ioctls);

   shim_device.version_major = 2;
   shim_device.version_minor = 50;
   shim_device.version_patchlevel = 0;

   /* nothing looks at the pci id, so fix it to a RV515 */
   static const char uevent_content[] =
      "DRIVER=radeon\n"
      "PCI_CLASS=30000\n"
      "PCI_ID=1002:7140\n"
      "PCI_SUBSYS_ID=1028:075B\n"
      "PCI_SLOT_NAME=0000:01:00.0\n"
      "MODALIAS=pci:v000010ded00005916sv00001028sd0000075Bbc03sc00i00\n";
   drm_shim_override_file(uevent_content,
                          "/sys/dev/char/%d:%d/device/uevent",
                          DRM_MAJOR, render_node_minor);
   drm_shim_override_file("0x0\n",
                          "/sys/dev/char/%d:%d/device/revision",
                          DRM_MAJOR, render_node_minor);
   drm_shim_override_file("0x1002",
                          "/sys/dev/char/%d:%d/device/vendor",
                          DRM_MAJOR, render_node_minor);
   drm_shim_override_file("0x1002",
                          "/sys/devices/pci0000:00/0000:01:00.0/vendor");
   drm_shim_override_file("0x7140",
                          "/sys/dev/char/%d:%d/device/device",
                          DRM_MAJOR, render_node_minor);
   drm_shim_override_file("0x7140",
                          "/sys/devices/pci0000:00/0000:01:00.0/device");
   drm_shim_override_file("0x1234",
                          "/sys/dev/char/%d:%d/device/subsystem_vendor",
                          DRM_MAJOR, render_node_minor);
   drm_shim_override_file("0x1234",
                          "/sys/devices/pci0000:00/0000:01:00.0/subsystem_vendor");
   drm_shim_override_file("0x1234",
                          "/sys/dev/char/%d:%d/device/subsystem_device",
                          DRM_MAJOR, render_node_minor);
   drm_shim_override_file("0x1234",
                          "/sys/devices/pci0000:00/0000:01:00.0/subsystem_device");
}